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A resistor intended for low-resistance work is provided with four terminals so that

  • A.two independent measurements can be taken and averaged to remove the random error
  • B.the resistor can be used either as a shunt or as a series multiplier as required
  • C.the potential leads carry no current
  • D.the current can be reversed without disturbing the connections to the galvanometer circuit

Answer: C

The outer pair carries the measuring current and the inner pair taps the potential difference across a defined length of the element. Since the potential leads feed a high-impedance detector they carry virtually no current, so their own resistance and the contact drops at their junctions do not enter the result.

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